/*printout.c -- 使用转换说明*/
#include "stdio.h"

#define PI 3.1415926

int main(void){

    int number = 7;
    float pies = 12.75;
    int cost = 7800;

    printf("PI:%f.\n",PI);
    printf("%c%d",'$',2*cost);
    return 0;
}